Speed-indicating device.



No. 732,953. PATENTBD JULY 7, 1903.' 1

T. D. & 'J. D. MILLEA 61: M. J. & E. J. CARROLL.

SPEED INDIGATING DEVIGE.

- LPPLIOATION nun. me. so. 1901.

no noun.

7M a. aw: 7'

No. mm.

UNITED STATES Patented July *7, 1903 1 PATENT OFFIcE.

THOMAS D. MILLEA,.JOHN D. MILLEA, MICHAEL J. CARROLL, AND EDWARD JCARROLL, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNORS TO CON- SOLIDATEDENGINE STOP COMPANY, OF NEW YORK, N. Y.,- A CORPORA- TION OFCONNECTICUT.

SPECIFICATION forming part of Letters Patent No. 732,953, dated July '7,1903.

Application filed August 30,1901- Serial No. 73,800. (No model.)

To on whom it ntrty concern:

Be it known that we, THOMAS D. lVlILLEA, JOHN D. MILLEA, MICHAEL J.CARROLL, and EDWARD J. CARROLL,all citizens of the United 5 States ofAmerica, residing at Springfield, in

the county of Hampden and State of Massachusetts, have invented a newand useful Speed Indicating and Limiting Device, of which the followingis a specification.

10 Our invention relates to speed indicating and limiting devices formotors, shafts, and machines in which certain peculiarly constructedandarranged mechanism is employed to move a pointer over a dial or intoconjunction with an electrical contact-point, the dial and contact-pointentering into said invention as important elements thereof, all ashereinafter fully described, and especially pointed out in the claims;and the objects of our improvement are, first, to provide a device bywhich the speed of a motor, shaft, or machine may be accuratelyindicated, and, second, to provide a device by which a suitable stoppingor regulating appliance may be or machine may be stopped or haveitsspeed limited orregulated. We attain these objects by the mechanismillustrated in the accompanying drawing, in which the preferred form ofconstruction of our device is illustrated by a perspective view.

Similar letters refer to similar parts throughout.

In the construction of our device a suitable support is provided, whichmay be of any convenient form; but we prefer to use a case a, mounted ona standard 25 and provided with a door I). A shaft 0 is journaled in thecase a by means of suitable bearings, and collars or other similardevices are employed to prevent longitudinal movement of said shaft, oneof such collars being seen at s in the drawing.

Mounted on the shaft 0 is a collar d, which is adapted to slidelongitudinally on said shaft, but is restrained from rotating thereon, afeather or any other of the Well-known means adapted to bring about thisresult and applicable in this device being employed. A

put in operation, whereby said motor, shaft,

It will now be understood, of course, that when the shaft 0 is revolvedrapidly the balls 9 will describe a circle of larger diameter than ifsaid shaft is rotated slowly, provided means be employed to constantlytend to draw said balls nearer the shaft. For the purposeof tensioningor drawing the balls toward the shaft we prefer to employa weight,although a spring may be used instead, but will not give the desiredaccuracy, yet in many instances it can be substituted for the weightwith goodresults. In this instance the weight is-suspended from an armj, which is rigidly attached to a stud t. The stud t is free to rotateso far as may be required, and the pointer Z or a rod upon which thepointer is mounted projects through said stud, with its lower endentering an annular recess u in the collar 01. A dial m is preferablymounted on the case a, and the pointer Z extends upward through aconvenientlyarranged slot in said case to a position where it is inoperative relation with the dial-face.

From the foregoing description it will be readily seen that the constanttendency of the weight 70 is to depress the arm j, and thus rotate thestud i, so as to carry the lower end of the pointer Zaway from thegovernor-balls, and with it the collar d, which in turn draws said ballstoward the shaft 0 through the medium of the arms h. The extent ofpowerexerted in this manner depends upon the location of the weight withreference to the stud, the amount of leverage being thereby varied, sothat if said -weight be moved away from said stud it will exert agreater force tending to rotate the stud in a direction to carry thelower end of the pointer Z to the right than when the weight is broughtnearer the stud.

Abelt is carried from any convenient part of the motor, shaft, ormachine the speed of which it is desired to indicate to the pulley r onthe outer end of the shaft 0, whereby the latter is caused to revolve,and the weight k is moved toward or away from the stud 2' until in aposition to properly indicate the desired normal speed through themedium of the pointer Z and the dial m, when the parts are secured inplace by set-screws or other convenient fastening means. Now when thespeed of the motor, shaft, or machine varies by becoming greater or lessthan the normal or usual desired speed the upper end of the pointer Zwill be actuated to the right or left accordingly to indicate suchvariation on the dial m, because an increase in speed causes thegovernor-balls to fly out or away from the shaft 0, and thus carry thesleeve (1 with the engaging end of said pointer to the left, which movesthe upper end thereof in the opposite direction, the weight being liftedat this time, and a decrease in speed permits said weight to operate onsaid pointer and sleeve, the lower end of the former forcing the latterto the right, which draws said balls inward toward said shaft, while theupper end of the pointer moves to the left on the dial. Since the dial mis suitably marked, the position of the adjacent end of the pointer 1shows at a glance whether or not the speed is normal and, if not normal,what is the amount of variation.

For the purpose of shutting down the motor or machine when its speedexceeds a certain predetermined limit an adjustable con tact-point n islocated on the dial on or elsewhere in the path of travel of the pointerZ. The contact-point it should be rendered adjustable through somesuitable agency, so that it may be moved toward or from the pointerlwhen in its normal position in order to meet the requirements ofdifferent speed limits. The contact-point n is in electrical connectionthrough the wires 0 and p with any of the well-knownelectrically-operated stopping devices for engines or motors. Hence whenthe pointer Z engages said contact-point a circuit is made and thestopping device set in operation to shut down the motor. This cannottake place, however, until the increased speed causes the governor-ballsto increase the distance between the shaft 0 and themselves and in turnto operate upon the pointerl through the medium of the interveningmechanism in the manner hereinbefore described.

This device may also be electrically connected with any of thewell-known checking apparatuses and such an apparatus set in operationwhen the pointer comes in contact with the pointnto limit the speed ofthe mov'sasst tor in the usual manner. Thus it will be seen that thisdevice maybe used to stop or limit the speed of a motor, as well as toaccurately indicate the rate of such speed.

We prefer that the shaft be placed horizontally; but it will be easilyunderstood how the shaft may stand vertically with the other membersarranged in operative connection therewith to produce the same resultswith out departing from the nature of our invention.

What we claim as our invention, and de= sire to secure by LettersPatent, is-

l. The combination, in a device of the class named, of a shaft and agrooved sleeve slid ingly mounted thereon, governor-balls mounted onsaid shaft, pivotal connections between said balls and sleeve, a rotarystud having an arm extending therefrom at an angle thereto, a weighthung on said arm, and a pointer directly attached to and movable withsaid stud with the base of said pointer engaging the groove in theslidable sleeve, substantially as shown and described.

2. The combination, in a device of the class named, of a shaft and agrooved sleeve slidingly mounted thereon, governor-balls mounted on saidshaft, pivotal connections between said balls and sleeve, a rotary studhaving an arm extending therefrom at an angle thereto, a weight hung onsaid arm, a pointer or contact member attached to and movable with saidstud with the base of said member engaging the groove in the sleeve, andan electrical contact-point in the path of travel of the contact member,substantially as shown and described.

3. The combination, in a device of the class named, of a shaft carryinga sliding sleeve, governor-balls mounted on said shaft and operativelyconnected with said sleeve, a rotary stud provided with an arm, anadjustable THOMAS D. MILLEA. JOHN D. MILLEA. MICHAEL J. CARROLL. EDWARDJ. CARROLL.

Witnesses:

F. A. CUTTER, S. SWEENEY.

